Dear Community

I have a Mikrotik RB750G between two switches which I abuse as a
'fill in' switch from which I need to access one specific vlan in
access mode (untagged on the wire) through one port.

'Switch all Ports' is on on the Mikrotik.

The two Switches are connected to ether1 and ether5

ether 2 to 5 are slaves of ether1

Both switches send untagged packets and tagged packets between their
interfaces via mikrotik ether1 <=> ether5

This works fine and transparently. The mikrotik is not touching the vlan
headers in transit and I get the untagged packets on the mikrotik. If I
create a vlan interface with a specific ID, I get the tagged packets on
that interface.

My Goal is to use ether3 on the Mikrotik als 'Access' Port for vlan 5.

When I do the following:

Remove the master 'ether1' from ether3.
Create vlan Interface 'vlan5' with master 'ether1'
Create a bridge 'br-vlan5' with Members 'vlan5 and ether3'

I can use ether3 as access port. A client on the wire of ether3 is
isolated in vlan 5 of my network.

But that goes through the Mikrotik CPU and can probably not reach
wire speed.

So I did the following:

Have ether2 to 5 as slaves of ether1.

On the switch 'ports' config of ether3:
=> vlan mode => secure
=> vlan header => always strip
=> default vlan id => 5

On the switch 'vlan' config of ether3:
=> Vlan id 5, Port ether3

As I understand the Wiki, this should only send packets with vlan ID 5
out of ether3 and strip the header, so they leave the wire untagged.

Untagged incomming packets should get tagged with ID 5.

I did play around a bit with vlan mode, or adding all three involved
ports on the switch 'vlan' settings.

Unfortunately none of my experiments worked. Untagged 'ingress' packets
seem not to get tagged.
Untagged packets who travel from ether1 to ether5 also leave ether3
untagged (like IPv6 RA) and don't get filtered out.

Any idea how I can use the switch features to create a wire speed access
port in a specific vlan?

-BenoƮt Panizzon-
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